The humans in this image are produced with makeHuman. It is very easy to give them some exact pose (there are many presets), export them to OBJ and import them into FreeCAD. They are not "animatable" anymore (you cannot change the pose in FreeCAD), but on the contrary they look much cooler than anything we could come up with in FreeCAD...

Nintendo have a very aggressive policy when it comes to using their intellectual property without their consent. Several Youtubers get their channels blocked by Nintendo for showing footage from Nintendo games. Basically, free publicity of Nintendo isn't good if it doesn't come from official Nintendo partners.

If you want to see Yorik in jail, by all means include Mario in FreeCAD, as this is the way to get Yorik in Japanese jail.

Just include four human figures, one 1.85 m and one 1.60 m, in standing and sitting positions, and that should be enough.